Improvement in clevises



,UNITEDFISTlvrnsv JOHN SCHOFIELD, OF MOLINE, ILLINOIS.

IMPROVEMENT IN CLEVISEIS.

Specification forming part of Letters Patent No. 172,180, dated January 11, 1876; application iiled November 6, 18,75.

To all lwhom it may concern:

Be it known that I, JOHN SoHoFiELD, of Moline, in the county of Bock Island and State of Illinois, have invented a'new and valuable Improvement in Plow-Glevi's; and I do hereby declare that the followin gV is a full, clear and exact description of the construction and operation ot' the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figure l of the drawings is a representation of a section of my clevis. Fig. 2 is a plan view of the same. Fig. 3 is a detail View.

This invention has relation to improvements in clevises for plows, cultivators,'planters, and

other like agricultural implements, wherein a i vertical adjustment' thereof is desirable.

The object of the invention and improvey ment is to produce a clevis attachment which ignates a plow-beam, in connection with which I propose to illustrate my invention. This, beam is provided upon its front end with a stirrup-shaped metallic strap or clevis, B, which has horizontal vibration in relation to the beam, and is attached thereto by means of a wrench-bolt, C, passing through eyes a, formed in the ends of the clevis, and a vertical perfo ration in the beam. By this means the said clevis is allowed to vibrate horizontally :into a positionoblique to the length of the beam for the purpose of landing"7 the plow; and,

in order that an adjustment for this purpose may be maintained, the shank of the clevis is provided with an enlargement, b, above and below the beam, through which are cut, in the are of a circle, a number of spaced perforations, c, any one of which may be made to regtice,`will be prevented from casual displace' ment by means of a spring-key, d, passing through a slot in the projecting lower end thereof. As shown in Fig. 2, clevis B is provided with circular notches e upon the inner edge of its vertical bar f, and it carries, permanently, a lilik, E, made of any suitable metal. This link is nearly of oval form, and it is provided upon each ot' its long sides with a narrowed portion, f/,of less thickness than the remainder of the link, the object of which will hereinafter appear. When this link is in position for drawingthat is to say, when 4it is engaged in one of the notches e-its extreme end will abut against the end of the beam A, and the said link will be held to its engagement with the said notch, but will be allowed to have free horizontal and vertical vibration therein. Consequently it will be unable to escape from the said notch, even though the team should be stopped.'

Should a vertical adjustment be requisite to suit the team, or for other reasons, the link will be turned at right angles toits former position, until its narrow portion is between the notched edge of the clevis and the end of the beam, when, by raising the link, it will escape from the notch, and be allowed to fall into a lower one, whe11,by turning the said link with its long axis in line with lthe plowbeam, it will be held to the adjustment thus I obtained. l

To adjust the link upward the outer end of the link may be lowered, when it may be thrust up and locked, as above described.

In order that this lock may be maintained and the plow be at the same time landed, the front end ot' the beam is curved, as shown in Fig. 2. This curvature is laid off with a radius equal to the distance from the central or axial line of the wrench-screw to the end. of the beam, where the curvature of the link and ot' the Vbeam are tangential to each other. Consequently, whatever be the position of the clevis, the link will, at all times, be locked to its adjustment, and is capable of being adjusted higher or lower, as above described.

That portion of the elevis above and below the beam is provided with a vertical flange, h, the front edge of which is flush with that of the beam, thus securing a lock for the link when the latter is engaged in the upper or lower notches e of the said elevis. f

What 1 claim, and desire to secure by Letters Patent, is-

The oblong link E, having graduated annular flanges g and a narrowed portion, g, in

combination with a notched clevis and -p1ow beam, substantially as specified.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

JOHN SCHOFIELD.

Witnesses H. H. GROVER, W. H. RICHARDS. 

